Eraser attachment for lead pencils



fMarch 9, 1937. s, s-r 1 v 2,073,369

; ERASER ATTACHMENT FOR LEAD PENCILS Original Filed Sept. 28, 1933 INVENTOR ATTORNEY Patented Mar. 9, 1937 UNITED. STATES, PATENT OFFICE Application September 28, 1933, Serial No. 691,290 7 Renewed August 14, 1936 3 Claims.

In the manufacture and attachment of rubber erasers to wooden lead pencils, a circular rubber tip has been found to give advantageous results, but many difficulties arise in the provision of an eraser which will approximate the life of the lead pencil itself without necessitating the adjustment of the eraser relatively to the ferrule, and without departing from the preferred circular form of the eraser. It is also desirable to provide a ferrule for a 1 pencil or other article, which will not be cumbersome, which will not interfere with the use of the pencil, and which can be manufactured at a minimum expense.

With the foregoing objects in view and other objects which will be hereinafter clearly set forth, my invention comprehends a pencil eraser and ferrule for attaching it to a pencil or other article.

It further comprehends a novel ferrule of substantially uniform diameter adapted to receive the reduced inner end of an eraser, and having a laterally extending flange at its outer end serving as an abutment for the body portion of the eraser and thus prevent abnormal deformation of the enlarged body portion of the eraser during the erasing operation.

It further comprehends a novel construction of an eraser and novel means for securing it while under pressure to the ferrule.

Other novel features of construction and advantage will hereinafter more clearly appear in the detailed description and the appended claims.

For the purpose of illustrating the invention, I have shown in the accompanying drawing typical embodiments of it, which, in practice, will give satisfactory and. reliable results. It is, however, to be understood that the various instrumentalities of which my invention consists can be variously arrange-d and organized, and my invention is not limited to the exact arrangement and organization of these instrumentalities as herein set forth.

Figure 1 is a side elevation of a pencil, in conjunction with which a ferrule and eraser em bodying my invention are employed.

Figure 2 is a sectional elevation thereof, the lead pencil being shown in dotted lines.

Figure 3 is an end View of the ferrule in detached position.

Figure 4 is a sectional view of the ferrule and eraser showing more clearly the manner in which the eraser, while being compressed, is secured tothe ferrule.

Similar numerals indicate corresponding parts.

Referring to the drawing:

I designates a ferrule and 2 an eraser embodying my invention, the ferrule being adapted to receive an end of a conventional lead pencil or other article 3. The outer end of the pencil is preferably of reduced diameter to fit into the ferrule and is secured thereto in any desire-d or conventional manner, for example by the screw threads 4. The ferrule I, except for the ornamental annular deformations, is of substantially uniform diameter throughout its length, but, at its outer end, it is deflected into a laterally extending annular flange 5 of substantial area.

The eraser 2 is of cylindrical contoursthroughout its length but of two diameters to provide an outer cylindrical body or erasing portion 6 of substantial mass, so that it will last as long asthe life of the pencil to which it is attached, and a cylindrical shank 1 of reduced diameter which will have a close fit in the outer end of the ferrule The reduced shank of the eraser forms a laterally extending annular shoulder 8 of substantially the same area as that of the flange 5 of the ferrule, so that the latter forms a firm abutment to prevent abnormal deformation of the erasing portion 6.

The eraser is preferably secured to the ferrule in a novel manner while under compression. The shank of the eraser is held under compression in the ferrule, and while under compression the flange 5 is indented as at 9 into the body portion to preferably form converging indentations as shown at 9, see Figure 4. When the pressure is released the eraser will be fixedly secured in the ferrule to be firmly held therein during the life of the erasing portion. 3

The flange 5 does not extend along the sides of the erasing portion 6 of the eraser, and, as a reduced shank is employed, I use a minimum of rubber and at the same time obtain a maximum mass of erasing portion.

The outer wall of such mass forms a smooth cylindrical surface.

The indentations 9 serve as anchors to retain the eraser in the ferrule and. it is unnecessary to use adhesive or screw threads on the ferrule.

These indentations preferably converge outwardly so that the rubber therebetween of the eraser is held under compression.

The indentations may be at any locations on the flange but are preferably in proximity to the base of the flange where it connects with the cylindrical portion of the ferrule.

Having thus described my invention what I claim as new and desire to secure by Letters Patent, is:

1. The herein described new article of manufacture, comprising a ferrule having at its outer end an eraser receiving portion, said ferrule being of substantially the same internal diameter throughout its length, said ferrule terminating at its outer end in a laterally extending annular flange, and an eraser having a cylindrical erasing portion of substantially uniform diameter, flat at its outer end, and having a shank of reduced diameter to enter the eraser receiving portion of the pencil, the reduced diameter of said shank forming a laterally extending shoulder of substantially the same area as that of said flange, which latter forms an abutment to prevent abnormal flexing of the erasing portion during the erasing operationand the diameter of said erasing portion being substantially the same as the outside diameter of said annular flange and being materially greater than that of a pencil to be received in said ferrule.

2. The herein described new article of manufacture, comprising a ferrule having at its outer end an eraser receiving portion, said ferrule being of substantially the same internal diameter throughout its length, said ferrule terminating at its outer end in a laterally extending annular flange and an eraser having a cylindrical erasing portion of substantially uniform diameter substantially flat at its outer end, and having a shank of reduced diameter to enter the eraser receiving portion of the pencil, the reduced diameter of said shank forming a laterally extending shoulder of substantially the same area as that of said flange, which latter forms an abutment to prevent abnormal flexing of the erasing portion during the erasing operation, the diameter of said erasing portion being substantially the same as the diameter of said flange and materially greater than the pencil in the ferrule and said flange having spaced indentations extending into the eraser to secure it to the ferrule. 4 I

3; The herein described new article of manufacture, comprising a ferrule having at its outer end an eraser receiving portion, said ferrule being of substantially the same internal diameter throughout its length, said ferrule terminating at its outer end in a laterally extending annular flange, and an eraser having a cylindrical erasing portion of substantially uniform diameter substantially flat at its outer end, and having a shank of reduced diameter to enter the eraser receiving portion of the pencil, the reduced diameter of saidshank forming a laterally extending shoulder of'substantially the same area as that of said flange, which latter forms an abutment to prevent abnormal flexing of the erasing portion during the erasing operation, said erasing portion having substantially the same diameter as that of said flange and of materially greater diameterthan a pencil receivable in said ferrule,

said flange having spaced indentations extending into the eraser to secure it to the ferrule and said flange having converging indentations holde ing the rubber therebetween under compression to secure the eraser to the ferrule.

' J OHN S. FURST. 

